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First let me say one of my favorite "professions" of any game is the Hauler from EvE. Not sure why but the fear factor of moving supplies from a safe zone to a .0 zone was amazing. Of course I did it becuase you could make tons of money. There were a few times where on my travels I was ambushed by 2-3 other players and they blew up my ship taking all the stuff I had on board setting me back weeks.
I would love to see this type of system in CU. People could buy high capacity mules to store all their harvested resources. Where as most players could store some stuff, a Mule would be able to carry way more than the average player and move it from the harvesting node back to the city to store in the bank. If you needed to repair a huge keep, you'd need a few haulers with these mules filled with wood and stone to come to the keep to repair it. If a player was killed the mules could be stolen by the enemey realm and all the contents would go to the victor.
Now as to localized banking. I think it would be cool if a guild set up shop in a particular area and that was where you had to go to access your guild bank. Now you could set up other guild banks at any of the other cities but it wouldn't be linked to the main one, very similar to how EvE handles banks. Same thing for players. if you put an item in the main city bank, you MUST go back to the main city to access that bank. This also ties into the whole idea of players setting up item shops all over the place. Maybe the cheaper shops would be the safe city zones while the more exspensive shops would be in highly contested areas, but these shops would still be needed for players to buy siege or potions or whatever for players that didn't want to take the long trek back to the main city to do so.
Just some ideas I hope make it into the game.
I healed Mistwraith and all I got was this stupid tee-shirt!